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前面部分的 Last week I went to the theatre.I had a very good seat.The play was very interesting.I did not enjoy it. 用于介紹背景，所以用了一般過去時。　　

A young man and a young woman were sitting behind me.They were talking loudly. 用于描述當(dāng)時的情況，由于當(dāng)時動作正在進行，故了過去進行時。當(dāng)然，此處用一般過去時也不能算錯，但“效果”肯定不如用過去進行時好。仔細(xì)體會一下吧。